<template>
  <div class="app-container">
    <el-form label-width="120px">
      <el-form-item label="信息描述">
        <el-tag type="info">excel模版说明</el-tag>
        <el-tag>
          <i class="el-icon-download"/>
          <a :href="'static/subjectTest.xlsx'">点击下载模版</a>
        </el-tag>
      </el-form-item>
      <el-form-item label="选择Excel">
        <el-upload
          ref="upload"
          :auto-upload="false"
          :on-success="fileUploadSuccess"
          :on-error="fileUploadError"
          :disabled="importBtnDisabled"
          :limit="1"
          :action="BASE_API+'/eduservice/subject/add/subject'" 
          name="file"
          accept="application/vnd.openxmlformats-officedocument.spreadsheetml.sheet">
          <el-button slot="trigger" size="small" type="primary">选取文件</el-button>
          <el-button
            :loading="loading"
            style="margin-left: 10px;"
            size="small"
            type="success"
            @click="submitUpload">{{ fileUploadBtnText }}</el-button>
        </el-upload>
      </el-form-item>
    </el-form>
  </div>
</template>

<script>

export default {
    data(){
        return {
            // 声明上传文件属性
            BASE_API: process.env.BASE_API, // 接口API地址

            //OSS_PATH: process.env.OSS_PATH, // 阿里云OSS地址
            fileUploadBtnText: '上传至服务器', // 按钮文字
            importBtnDisabled: false, // 按钮是否禁用,
            loading: false // 上传动画
        }
    },
    created(){

    },
    methods:{
        // 上传成功 回调
        fileUploadSuccess(response){

            this.loading = false;
            this.$message({
                type: 'success',
                message: '导入课程分类信息成功！'
            });
            // 添加成功，通过路由跳转到 课程列表
            this.$router.push({path:'/subject/list'});
        },
        // 上传失败 回调
        fileUploadError(){
            this.loading = false;
            this.$message({
            type: 'error',
            message: '导入课程分类信息失败！'
            });
        },
        // 点击上传文件 到 后台接口
        submitUpload(){
            this.fileUploadBtnText = '正在上传';
            this.importBtnDisabled = true;
            this.loading = true;
            // 此方式为  不同表单提交
            this.$refs.upload.submit();
        }
    }

}
</script>